mysql命令行开启慢查询日志的方法：执行【set global slow_query_log=’ON’;】语句即可开启。通过执行【show variables like “%slow%”;】语句可以检查慢查询日志是否已开启。
具体方法：
（推荐教程：mysql教程）
查看一下默认慢查询的时间10秒
mysql> show variables like "%long%"; +-----------------+-----------+ | Variable_name | Value | +-----------------+-----------+ | long_query_time | 10.000000 | +-----------------+-----------+ 1 row in set (0.00 sec)
设置成3秒，加上global,退出再次进入生效
mysql> set global long_query_time=3; Query OK, 0 rows affected (0.00 sec)
查看一下慢查询是不是已经开启
mysql> show variables like "%slow%"; +---------------------+---------------------------------+ | Variable_name | Value | +---------------------+---------------------------------+ | log_slow_queries | OFF | | slow_launch_time | 2 | | slow_query_log | OFF | | slow_query_log_file | /usr/local/mysql/mysql-slow.log | +---------------------+---------------------------------+ 4 rows in set (0.00 sec)
启用慢查询
mysql> set global slow_query_log='ON'; Query OK, 0 rows affected (0.28 sec)
查看是否已经开启
mysql> show variables like "%slow%"; +---------------------+---------------------------------+ | Variable_name | Value | +---------------------+---------------------------------+ | log_slow_queries | ON | | slow_launch_time | 2 | | slow_query_log | ON | | slow_query_log_file | /usr/local/mysql/mysql-slow.log | +---------------------+---------------------------------+ 4 rows in set (0.00 sec)
相关推荐：mysql教程
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喜欢就支持一下吧
